Hi, I'm working on building RTSDK libraries when I get an error. Following the official instructions, I download the whole github package and run cmake successfully (cmake -HRTSDK -BRTSDK_build, which generate the build directory I named RTSDK_build). Then I cd to this RTSDK_build dir and run make, and it failed as follows:

I'd like to ask how to solve this problem. I'm building under Ubuntu 20.04.1, gcc version 9.3.0, cmake version 3.18.4